Logarithm Operator

The logarithm operator is the inverse operation of the exponent operator. The operation has a base represented by the variable and operates on an input expression represented by the variable .


The examples below demonstrate the basic pattern the logarithm operator exhibits when the base is the same for the input numbers.

Base 2

Base 3

Base 5

Exponents, Logarithms and Radicals

The logarithm operator is closely related to the exponential and radical operators as shown in the table below. Conceptually, the behavior of each of the operators is framed using the scenario of population growth, where the initial population is represented with a value of , the variable represents growth rate, the variable repesents time elapsed, and the variable represents the population.

Equation Operator
Given the growth rate and the time elapsed, the exponent operator returns the population.
Given the growth rate and the population the logarithm operator returns the time elapsed.
Given the time elapsed and the population the radical operator returns the growth rate.

Another way to visualize the behavior of these operators is outlined in this article about exponential trees.

Properties of Logarithms

Name Property